Megumin, Explosive Mage

If Megumin is destroyed before your next turn, all explosion spells are countered

Explosion {5}{r}{r}{r} Deals 10 damages to all of your opponent’s creatures at the beginning of your next turn,
tap Megumin and put a stun counter on her after that

Even bigger explosion {6}{r}{r}{r}, Tap all your creatures, deals 10 damages to all of your opponent’s creatures and 10 life points to your opponents at the beginning of your next turn, then exile Megumin